Chimera of death they are called and they are genetically manufactured creatures used in war.
Both claws on the head and the tail are extremly venomous and can kill a human fast. The wings are too small to enable them to fly, but they are enough for gliding or stopping otherwise deadly falls.
Often a huge pack of them were packed into a plane and tossed out in the warzone. Special pheromons were used on allies to spare them of being hunted down and killed by these creatures.
Some of the chimeras managed to escape the facilities were they were kept and bred though and roaming around freely. Humans on the whole world were warned to run and find a hiding spot as fast as possible when seeing such a creature from afar, because they don't only kill to survive, they kill because they were bred and programmed to do so.